Method of manufacturing foundry flasks



July 27, 1937.

w 1. R. SMITH METHOD OF MANUFACTURING FOUNDRY FLASKS Filed March 22,1935 INVENTOR.

Patented July 27, 1937 rise METHOD OF MANUFACTURING FOUNDRY FLASKSIrving R. Smith, Milwaukee, Wis, assignor to Sterling WheelbarrowCompany, Milwaukee, Wis, a corporation of Wisconsin iippiication March22, 1935, Serial No. 12,344

2 Claims. I (Cl. 29148.2)

. This invention relates to improvements in the method of manufacturingfoundry flasks.

In my co-pending application Serial No. 3,607, is disclosed a foundryflask, each section of which is preferably formed of three elongatedstrips of metal. One of said strips comprises standard bar stockpreferably circular or rectangular in cross section, and the other twostrips are flat and formed of rolled metal provided with a flange on onelongitudinal edge thereof. Ihe non-flanged edge of one of said lastmentioned strips is adapted to be welded to one side of the standard barstock, and the non-flanged edge of another of said rolled strips isadapted to be welded to the other side of said standard bar stock. Thebar stock is adapted to form a substantially central, longitudinal,twist resisting rib of enlarged cross section, and the purpose of thisrib is to provide a strong compact reinforcement so that the flasksection will offer maximum resistance to torsional strains. By formingthe flask section of three longitudinally joined strips, it is possibleto so assemble the same as to have the edge flanges extend in anydesired direction, that is, either inwardly or outwardly, depending uponthe type of work for which the flask is to be used, and it is alsopossible by carrying strips of rolled metal of various Widths to combinethe strips in various Ways so as to produce flask sections of anydesired heighth within a given range.

In my Patent No. 1,974,292 all of the different rolled metal stripswhich it was necessary to stock in order to produce flask sections of aselected heighth and cross sectional shape, were of special form. andhad to be specially fashioned. It was found that this resulted inprohibitive expense for materials. In my co-pending application abovereferred to, is disclosed a flask section in which standard bar stockmay be utilized to provide the twist resisting rib, thereby decreasingsomewhat the expense of manufacture, but not to a suflicient extent tomake the method commercially practical. It is an object of the presentinvention to provide a method of forming flask sections of the typedisclosed in. my former patent and. co-pending application wherein thespecial flanged metal strips may be provided in a plurality of widths ina very inexpensive manner. V

A more specific object of the invention is toprovide a method ofmanufacturing foundry flasks wherein channel iron of but one width is sooperated upon as to produce an unlimited number of metallic strips ofvarying widths,

each strip having one longitudinal edge flanged so as to be suitable foruse in forming flask sections of the type above described.

With the above, and other objects in view, th invention consists of theimproved method of manufacturing'foundry flasks and all its parts andcombinations and all equivalents thereof.

In the accompanying drawing in which the same reference numeralsdesignate the same parts in all the views,

Fig. 1 is a perspective view illustrating a channel iron suitable foruse in. connectionv with the improved method;

Fig. 2 is a similar view showing the channel iron slit longitudinallyand part slit transversely to provide strips of a desired length andwidth for forming a particular flask section;

Fig. 3 is across sectional view through a flask section, showing thestructure thereof;

Fig. 4 is a perspective View showing a partially completed flasksection; and

Figs. 5 to 8 inclusive are cross sectional views through the channeliron of Fig. 1, showing how it may be longitudinally slit at variouspoints to produce metal strips of various widths.

In carrying out the improved method, it is necessary to stock but twotypes of material, channel iron 9, shown in Fig. l, and bar stock Ill.The channel iron 9 may be obtained in any desired length and may be 10inches in width. It

vide a strip l2 two inches in width and a strip I3 eight inches in width(see Fig. 5), each strip necessarily having one of the flanges I I inconnection therewith.

The two-inch strip i2 is then cut transversely as at M to form aplurality of strips of the required length for the flask section. Thesetwo strips are then positioned with their non-flanged edges adjacent theside of the bar stock Ill in the manner shown in Fig. 3, and welding isperformed as at E5 in therecesses resulting from the juxtaposition ofstraight edges adjacent a circular bar. Thus a flask section is formed,one side of which is relatively straight and regular and the other sideof which has the major portion of the bar Ill projecting therefrom toform a relatively heavy, solid, twist-resisting, reenforcing ribentirely around the flask section. The flanges l I may of course beoriginally positioned to extend in any desired direction. After thevarious strips have been welded, they are bent either into half-flasksections or into full flask sections as shown in Fig. 4. The necessaryhandles and fittings may then be attached thereto in any known manner.

The strip [3 left over from the original channel iron 9 may be put asideand subsequently used when it is desired to manufacture a flask sectionof maximum heighth.

By longitudinally slitting one of the channel irons 9 in the mannershown in Fig. 6, strips l6, three inches in width, and strips IT, seveninches, may be produced. Similarly, as shown in Fig. 7, strips i8, fourinches in width, and 19, six inches in width, may be provided.

By slitting the channel iron exactly in the center, in the manner shownin Fig. 8, five-inch strips 25 may be formed.

It will thus be seen that by stocking only teninch channel iron, stripsof seven diiierent widths may be formed, each having a flange along onelongitudinal edge. This number of strips is suflicient for forming,together with the bar stock I 8, flash sections of any required heighth,or cross sectional shape, as they may be combined in any desired manner,and the flanges may be turned either inwardly or outwardly or indifferent directions from one another, depending upon requirements.

Before the present invention, it was necessary to specially fashion eachof the strips i2, 53, Ni, ll, !8, l9, and 20, whereas now they can allbe provided in a simple manner by slitting a single type of channel ironalong a desired line.

After the necessary fittings have been attached to the flask sectionsshown in Fig. 4, two of said sections may be superimposed, one formingthe cope and the other forming the drag of a twopart flask. In view ofthe fact that both of the flanges i i extend outwardly in the sectionshown in Fig. 4, this type of flask is particularly suited for workwherein it is desired to have facility in insertion of the sand and easeof shake-out, and due to the use of both upper and lower flanges, thistype of section may be readily used for building up a plural sectionflask wherein the flanges form seats for the flask section above. Ifboth of the flanges extended inwardly instead of outwardly, the flasksection would be particularly suitedfor work wherein it is required thatthe sand be retained in position in both directions. The presentinvention makes it possible to selectively position the flanges duringmanufacture.

It is obvious that the standard bar stock it] may be of any otherstandard cross sectional shape as disclosed in my co-pending applicationSerial No. 3,607, the circular type being illustrated herein as a morecommon form.

It is to be understood that all modifications are contemplated as maycome within the scope of the claims.

What I claim is:

1. The method of manufacturing foundry flasks comprising longitudinallyslitting a metallic channel along a desired line to provide two metallicstrips of predetermined width each having one longitudinal edge flanged,severing said strips transversely to provide strips of predeterminedlength, welding the non-flanged edge of a selected one of said lastmentioned strips to one side of a standard metallic bar of circular andenlarged cross section with the strip so positioned that its flangeextends in a predetermined direction, welding the non-flanged edge ofanother selected strip to the other side of said standard metallic barwith said strip so positioned that its flange extends in a predetermineddirection with respect to the flange of the first strip to form afoundry flask of predetermined heighth and cross sectional shape, andbending said joined strips to requisite form.

2. The method of manufacturing foundry flasks comprising longitudinallyslitting a metallic channel along a desired line to provide two metallicstrips of predetermined width, each having one longitudinal edgeflanged, severing said strips transversely to provide strips ofpredetermined length, welding the non-flanged edge of a selected one ofsaid last mentioned strips to one side of a standard metallic bar ofcircular and enlarged cross section, welding the non-flanged edge ofanother selected strip to the other side of said standard metallic barto form a foundry flask of predetermined heighth, and bending saidjoined strips to requisite form.

IRVING E. SMITH.

